MIC2182YM Micrel Inc, MIC2182YM Datasheet
MIC2182YM
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MIC2182 General Description Micrel’s MIC2182 is a synchronous buck (step-down) switch- ing regulator controller. An all N-channel synchronous archi- tecture and powerful output drivers allow 20A output current capabilty. The PWM and skip-mode control scheme allows efficiency ...
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... MIC2182 Ordering Information Part Number MIC2182BM MIC2182-3.3BM MIC2182-5.0BM MIC2182BSM MIC2182-3.3BSM MIC2182-5.0BSM MIC2182YM MIC2182-3.3YM MIC2182-5.0YM MIC2182YSM MIC2182-3.3YSM MIC2182-5.0YSM Pin Configuration MIC2182 SS 1 PWM 2 COMP 3 SGND 4 SYNC 5 EN/UVLO CSH 8 Adjustable 16-pin SOP (M) 16-Pin SSOP (SM) M9999-042204 Voltage Temperature Range Adjustable – +85 C 3.3V – +85 C 5.0V – ...
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MIC2182 Pin Description Pin Number Pin Name PWM 3 COMP 4 SGND 5 SYNC 6 EN/UVLO 7 (fixed) VREF 7 (adj CSH 9 VOUT 10 VIN 11 VDD 12 PGND 13 LSD 14 BST 15 ...
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MIC2182 Absolute Maximum Ratings Analog Supply Voltage (V ) ....................................... +34V IN Digital Supply Voltage (V ) ......................................... +7V DD Driver Supply Voltage (B ) .................................... V ST Sense Voltage ( ............................. 7V to –0.3V OUT SH ...
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MIC2182 Parameter Condition Reference Output (Fixed Versions Only) Reference Voltage Reference Line Regulation 6V < V Reference Load Regulation 0 A < I Enable/UVLO Enable Input Threshold UVLO Threshold Enable Input Current V EN/UVLO Soft Start Soft-Start Current V SS ...
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MIC2182 Typical Characteristics Quiescent Current vs. Temperature 2.0 1.8 PWM 1.6 1.4 1.2 1.0 0.8 Skip 0.6 0.4 0.2 0 -40 - 100120140 TEMPERATURE ( C) Quiescent Current vs. Supply Voltage 1.5 1.0 UVLO Mode ...
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MIC2182 Soft-Start Current vs. Temperature 5.0 4.8 4.6 4.4 4.2 4.0 -40 - 100120140 TEMPERATURE ( C) April 22, 2004 Overcurrent Threshold vs. Temperature 0.12 0.11 0.10 0.09 0.08 -40 - ...
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MIC2182 Block Diagrams EN/UVLO Control Logic PWM 2 PWM CORRECTIVE RESET RAMP SYNC Oscillator 5 COMP 3 C COMP R COMP MIC2182 [adj.] M9999-042204 V DD Reference V IN Current Limit PWM Mode to Skip Mode 0.024V ...
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MIC2182 EN/UVLO Control Logic PWM 2 PWM CORRECTIVE RESET RAMP SYNC Oscillator 5 COMP 3 C COMP R COMP MIC2182-x.x April 22, 2004 V DD Reference V IN Current Limit PWM Mode to Skip Mode 0.024V Skip-Mode ...
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MIC2182 Functional Description See “Applications Information” following this section for com- ponent selection information and Figure 14 and Tables 1 through 5 for predesigned circuits. The MIC2182 is a BiCMOS, switched-mode, synchronous step-down (buck) converter controller. Current-mode control is used ...
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MIC2182 A block diagram of the MIC2182 PWM current-mode control loop is shown in Figure 3 and the PWM mode voltage and current waveforms are shown in figure 5A. The inductor current is sensed by measuring the voltage across the ...
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MIC2182 Reset Pulse V HSD V LSD V HSD V LSD one-shot V OUT I OUT A hysteretic comparator is used in place of the PWM error amplifier and a current-limit ...
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MIC2182 Switching from PWM to Skip Mode The current sense amplifier in Figure 3 monitors the average voltage across the current-sense resistor. The controller will switch from PWM to skip mode when the average voltage across the current-sense resistor drops ...
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MIC2182 The enable pin (pin 6) has two threshold levels, allowing the MIC2182 to shut down in a low current mode, or turn off output switching in UVLO mode. An enable pin voltage lower than the shutdown threshold turns off ...
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MIC2182 • Reduced maximum duty cycle due to switching transition times and constant delay times in the controller. As the switching frequency increased, the switching period decreases. The switching transition times and constant delays in the MIC2182 start to become ...
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MIC2182 Applications Information The following applications information includes component selection and design guidelines. See Figure 14 and Tables 1 through 5 for predesigned circuits. Inductor Selection Values for inductance, peak, and RMS currents are required to select the output inductor. ...
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MIC2182 charge can be a significant source of power dissipation in the MIC2182. At low output load this power dissipation is notice- able as a reduction in efficiency. The average current re- quired to drive the high-side MOSFET is: I ...
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MIC2182 For the low-side switch (N-channel MOSFET), the dc power dissipation is (rms) switch2(dc) DS(on Since the ac switching losses for the low side MOSFET is near zero, the total power dissipation is ...
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MIC2182 The input voltage ripple will primarily depend on the input capacitors ESR. The peak input current is equal to the peak inductor current, so inductor(peak) ESR The input capacitor must be rated for ...
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MIC2182 pins and routed with a wide trace. The capacitor should be a good quality tantalum. An additional 1 F ceramic capacitor may be necessary when driving large MOSFETs with high gate capacitance. Incorrect placement of the V capacitor will ...
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MIC2182 Predesigned Circuits A single schematic diagram, shown in Figure 14, can be used to build power supplies ranging from 3A to 10A at the common output voltages of 1.8V, 2.5V, 3.3V, and 5V. Components that vary, depending upon output ...
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MIC2182 3A (6.5V–30V) Reference Part No. / Description C7 qty: 2 TPSE227M010R0100 AVX, 220 F 10V, 0.1 ESR, output filter capacitor C11 qty: 2 TPSE226M035R0300 AVX 35V, 0.3 ESR, input filter capacitor D1 qty: 1 B140, Vishay, freewheeling ...
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MIC2182 3A (4.5V–30V) Reference Part No. / Description C7 qty: 2 TPSE227M010R0100 AVX, 220 F 10V, 0.1 ESR, output filter capacitor C11 qty: 2 TPSE226M035R0300 AVX 35V, 0.3 ESR, input filter capacitor D1 qty: 1 B140, Vishay, freewheeling ...
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MIC2182 Power Supply Operating Characteristics Effect of Soft-Start Capacitor (C On Output Voltage Waveforms During Turn-On (10A Power Supply Configuration) Normal (300kHz Switching Frequency) and Output Short-Circuit (60kHz) Conditions Switch Node (Pin 15) Waveforms Typical Skip-Mode Waveforms M9999-042204 ) Value ...
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MIC2182 Load Transient Response and Bode Plot (4A Power Supply Configuration) Bode Plot (4A Power Supply Configuration) 100 210 80 180 60 150 GAIN 40 120 PHASE -20 30 -40 0 FREQUENCY (Hz) 12V Efficiency (4A ...
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MIC2182 Package Information 0.157 (3.99) 0.150 (3.81) 0.020 (0.51) REF 0.0648 (1.646) 0.0434 (1.102) 6.33 (0.239) 6.07 (0.249) 0.38 (0.015) 0.25 (0.010) 0.65 (0.0260) BSC M9999-042204 PIN 1 0.020 (0.51) 0.050 (1.27) BSC 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0.394 ...
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MIC2182 April 22, 2004 27 Micrel M9999-042204 ...
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MIC2182 MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for ...